code: def check_signatures(self, checker, canon_expected_pairs):
      for canon_args, expected in canon_expected_pairs:
          with self.subTest(f"{canon_args} -> {expected}"):
              self.assertEqual(
                  checker.CheckCanonicalizedArgs(canon_args), expected
              )
  
imports: import collections
  import numpy
  from tensorflow.python.framework import _pywrap_python_api_dispatcher
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import tensor
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops.ragged import ragged_factory_ops
  from tensorflow.python.ops.ragged import ragged_tensor
  from tensorflow.python.platform import googletest
label_desc: Use image node_id 1 for calling the PythonSignatureCheckerTest obj's underlying member method code with example usage: obj.check_signatures(checker, canon_expected_pairs) without return types